Hi, Ron,
A few things come to mind. The first one, IMO, renders the rest somewhat less
important.
Joe
-------------
- this approach applies only to IPv4; not sure it’s worth trying to optimize
for only that case
(it requires on-path fragmentation permitted)
- this approach relies on ICMPs, so it’s as robust (or, more to the point, not)
as PMTUD
if ICMPs can find the reverse path from the dest, why wouldn’t the
routers?
i.e., isn’t the problem with ICMPs not just routers not sending them
but firewalls BLOCKING them?
(i.e., if ICMPs would work here, PMTU would have worked, rendering this
unnecessary)
- why does this doc assume the max ICMP is 576?
we’re still talking IPv4 here; it’s still 68 (that’s why only 64 bits
of the orig payload are guaranteed)
(yes, your note in the end of sec 1 is relevant, but given v4-in-v4
tunneling, it’s possible that paths might be smaller than the 576 assumption)
- why would this approach find the largest fragment through a system?
rfc1812 talks about various strategies, one of which is “equal sized”,
which might never find the max the way you propose
> On Oct 29, 2019, at 9:53 AM, Ron Bonica
> <[email protected]> wrote:
>
> Folks,
>
> Please review and comment.
>
> Ron
>
>
>
> Juniper Business Use Only
>
> -----Original Message-----
> From: [email protected] <[email protected]>
> Sent: Tuesday, October 29, 2019 11:48 AM
> To: Ron Bonica <[email protected]>; Hakan Alpan <[email protected]>; Radon
> Rosborough <[email protected]>; Bradely Newton <[email protected]>; Miles
> President <[email protected]>; Manoj Nayak <[email protected]>
> Subject: New Version Notification for
> draft-bonica-intarea-lossless-pmtud-00.txt
>
>
> A new version of I-D, draft-bonica-intarea-lossless-pmtud-00.txt
> has been successfully submitted by Ron Bonica and posted to the IETF
> repository.
>
> Name: draft-bonica-intarea-lossless-pmtud
> Revision: 00
> Title: Lossless Path MTU Discovery (PMTUD)
> Document date: 2019-10-29
> Group: Individual Submission
> Pages: 8
> URL:
> https://tools.ietf.org/html/draft-bonica-intarea-lossless-pmtud-00
>
>
>
> Abstract:
> This document describes alternative IPv4 PMTUD procedures that do not
> prevent IP fragmentation and do no rely on the network's ability to
> deliver ICMP Destination Unreachable messages to the source node.
> This document also defines a new ICMP message. IPv4 nodes emit this
> new message when they reassemble a fragmented packet.
>
>
>
>
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> The IETF Secretariat
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